springboot学习之Thymeleaf模板引擎及原理介绍

<!--thymeleaf-->

<dependency>

     <groupId>org.springframework.boot</groupId>

     <artifactId>spring-boot-starter-thymeleaf</artifactId>

</dependency>

   // IntelliJ API Decompiler stub source generated from a class file

   // Implementation of methods is not available

package org.springframework.boot.autoconfigure.thymeleaf;

@org .springframework.boot.context.properties.ConfigurationProperties(prefix = "spring.thymeleaf" )

public class ThymeleafProperties {

     private static final java.nio.charset.Charset DEFAULT_ENCODING;

     public static final java.lang.String DEFAULT_PREFIX = "classpath:/templates/" ;

     public static final java.lang.String DEFAULT_SUFFIX = ".html" ;

     private boolean checkTemplate;

     private boolean checkTemplateLocation;

     private java.lang.String prefix;

     private java.lang.String suffix;

     private java.lang.String mode;

     private java.nio.charset.Charset encoding;

     private boolean cache;

     private java.lang.Integer templateResolverOrder;

     private java.lang.String[] viewNames;

     private java.lang.String[] excludedViewNames;

     private boolean enableSpringElCompiler;

     private boolean renderHiddenMarkersBeforeCheckboxes;

     private boolean enabled;

     private final org.springframework.boot.autoconfigure.thymeleaf.ThymeleafProperties.Servlet servlet;

     private final org.springframework.boot.autoconfigure.thymeleaf.ThymeleafProperties.Reactive reactive;

     public ThymeleafProperties() { /* compiled code */ }

     public boolean isEnabled() { /* compiled code */ }

     public void setEnabled( boolean enabled) { /* compiled code */ }

     public boolean isCheckTemplate() { /* compiled code */ }

     public void setCheckTemplate( boolean checkTemplate) { /* compiled code */ }

     public boolean isCheckTemplateLocation() { /* compiled code */ }

     public void setCheckTemplateLocation( boolean checkTemplateLocation) { /* compiled code */ }

     public java.lang.String getPrefix() { /* compiled code */ }

     public void setPrefix(java.lang.String prefix) { /* compiled code */ }

     public java.lang.String getSuffix() { /* compiled code */ }

     public void setSuffix(java.lang.String suffix) { /* compiled code */ }

     public java.lang.String getMode() { /* compiled code */ }

     public void setMode(java.lang.String mode) { /* compiled code */ }

     public java.nio.charset.Charset getEncoding() { /* compiled code */ }

     public void setEncoding(java.nio.charset.Charset encoding) { /* compiled code */ }

     public boolean isCache() { /* compiled code */ }

     public void setCache( boolean cache) { /* compiled code */ }

     public java.lang.Integer getTemplateResolverOrder() { /* compiled code */ }

     public void setTemplateResolverOrder(java.lang.Integer templateResolverOrder) { /* compiled code */ }

     public java.lang.String[] getExcludedViewNames() { /* compiled code */ }

     public void setExcludedViewNames(java.lang.String[] excludedViewNames) { /* compiled code */ }

     public java.lang.String[] getViewNames() { /* compiled code */ }

     public void setViewNames(java.lang.String[] viewNames) { /* compiled code */ }

     public boolean isEnableSpringElCompiler() { /* compiled code */ }

     public void setEnableSpringElCompiler( boolean enableSpringElCompiler) { /* compiled code */ }

     public boolean isRenderHiddenMarkersBeforeCheckboxes() { /* compiled code */ }

     public void setRenderHiddenMarkersBeforeCheckboxes( boolean renderHiddenMarkersBeforeCheckboxes) { /* compiled code */ }

     public org.springframework.boot.autoconfigure.thymeleaf.ThymeleafProperties.Reactive getReactive() { /* compiled code */ }

     public org.springframework.boot.autoconfigure.thymeleaf.ThymeleafProperties.Servlet getServlet() { /* compiled code */ }

     public static class Reactive {

         private org.springframework.util.unit.DataSize maxChunkSize;

         private java.util.List<org.springframework.http.MediaType> mediaTypes;

         private java.lang.String[] fullModeViewNames;

         private java.lang.String[] chunkedModeViewNames;

         public Reactive() { /* compiled code */ }

         public java.util.List<org.springframework.http.MediaType> getMediaTypes() { /* compiled code */ }

         public void setMediaTypes(java.util.List<org.springframework.http.MediaType> mediaTypes) { /* compiled code */ }

         public org.springframework.util.unit.DataSize getMaxChunkSize() { /* compiled code */ }

         public void setMaxChunkSize(org.springframework.util.unit.DataSize maxChunkSize) { /* compiled code */ }

         public java.lang.String[] getFullModeViewNames() { /* compiled code */ }

         public void setFullModeViewNames(java.lang.String[] fullModeViewNames) { /* compiled code */ }

         public java.lang.String[] getChunkedModeViewNames() { /* compiled code */ }

         public void setChunkedModeViewNames(java.lang.String[] chunkedModeViewNames) { /* compiled code */ }

     }

     public static class Servlet {

         private org.springframework.util.MimeType contentType;

         private boolean producePartialOutputWhileProcessing;

         public Servlet() { /* compiled code */ }

         public org.springframework.util.MimeType getContentType() { /* compiled code */ }

         public void setContentType(org.springframework.util.MimeType contentType) { /* compiled code */ }

         public boolean isProducePartialOutputWhileProcessing() { /* compiled code */ }

         public void setProducePartialOutputWhileProcessing( boolean producePartialOutputWhileProcessing) { /* compiled code */ }

}

<!DOCTYPE html>

< html lang = "en" xmlns:th = "http://HdhCmsTestthymeleaf.org" >

< head >

     < meta charset = "UTF-8" >

     < title >ZP</ title >

</ head >

< body >

< h1 >测试页面</ h1 >

<!--th:text就是将div中的内容设置为它指定的值，和之前学习的Vue一样-->

< div th:text = "${msg}" ></ div >

</ body >

</ html >

package com.example.zpspringboot3.controller;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;

/**

  * @Author: zhangpeng

  * @Date: 2022/2/21 16:02

  */

@Controller

public class TestController {

//    @RequestMapping("/t1")

//    public String test1(){

//        //classpath:/templates/test.html

//        return "text";

//    }

     @RequestMapping ( "/t1" )

     public String test1(Model model){

         //存入数据

         model.addAttribute( "msg" , "Hello,Thymeleaf" );

         //classpath:/templates/test.html

         return "text2" ;

     }

}

Simple expressions:（表达式语法）

Variable Expressions: ${...}：获取变量值；OGNL；

     1 ）、获取对象的属性、调用方法

     2 ）、使用内置的基本对象：# 18

          #ctx : the context object.

          #vars: the context variables.

          #locale : the context locale.

          #request : (only in Web Contexts) the HttpServletRequest object.

          #response : (only in Web Contexts) the HttpServletResponse object.

          #session : (only in Web Contexts) the HttpSession object.

          #servletContext : (only in Web Contexts) the ServletContext object.

     3 ）、内置的一些工具对象：

　　　　　　#execInfo : information about the template being processed.

　　　　　　#uris : methods for escaping parts of URLs/URIs

　　　　　　#conversions : methods for executing the configured conversion service ( if any).

　　　　　　#dates : methods for java.util.Date objects: formatting, component extraction, etc.

　　　　　　#calendars : analogous to #dates , but for java.util.Calendar objects.

　　　　　　#numbers : methods for formatting numeric objects.

　　　　　　#strings : methods for String objects: contains, startsWith, prepending/appending, etc.

　　　　　　#objects : methods for objects in general.

　　　　　　#bools : methods for boolean evaluation.

　　　　　　#arrays : methods for arrays.

　　　　　　#lists : methods for lists.

　　　　　　#sets : methods for sets.

　　　　　　#maps : methods for maps.

　　　　　　#aggregates : methods for creating aggregates on arrays or collections.

==================================================================================

   Selection Variable Expressions: *{...}：选择表达式：和${}在功能上是一样；

   Message Expressions: #{...}：获取国际化内容

   Link URL Expressions: @{...}：定义URL；

   Fragment Expressions: ~{...}：片段引用表达式

Literals（字面量）

       Text literals: 'one text' , 'Another one!' ,…

       Number literals: 0 , 34 , 3.0 , 12.3 ,…

       Boolean literals: true , false

       Null literal: null

       Literal tokens: one , sometext , main ,…

Text operations:（文本操作）

     String concatenation: +

     Literal substitutions: |The name is ${name}|

Arithmetic operations:（数学运算）

     Binary operators: + , - , * , / , %

     Minus sign (unary operator): -

Boolean operations:（布尔运算）

     Binary operators: and , or

     Boolean negation (unary operator): ! , not

Comparisons and equality:（比较运算）

     Comparators: > , < , >= , <= ( gt , lt , ge , le )

     Equality operators: == , != ( eq , ne )

Conditional operators:条件运算（三元运算符）

     If-then: ( if ) ? (then)

     If-then- else : ( if ) ? (then) : ( else )

     Default: (value) ?: (defaultvalue)

Special tokens:

     No-Operation: _

@RequestMapping ( "/t2" )

    public String test2(Map<String,Object> map){

        //存入数据

        map.put( "msg" , "<h1>Hello</h1>" );

        map.put( "users" , Arrays.asList( "zp" , "zhangpeng" ));

        //classpath:/templates/test.html

        return "text3" ;

    }

<!DOCTYPE html>

< html lang = "en" xmlns:th = "http://HdhCmsTestthymeleaf.org" >

< head >

     < meta charset = "UTF-8" >

     < title >狂神说</ title >

</ head >

< body >

< h1 >测试页面</ h1 >

< div th:text = "${msg}" ></ div >

<!--不转义-->

< div th:utext = "${msg}" ></ div >

<!--遍历数据-->

<!--th:each每次遍历都会生成当前这个标签：官网#9-->

< h4 th:each = "user :${users}" th:text = "${user}" ></ h4 >

< h4 >

     <!--行内写法：官网#12-->

     < span th:each = "user:${users}" >[[${user}]]</ span >

</ h4 >

</ body >

</ html >